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Method for synthesizing single-atom catalyst, single-atom catalyst and application

A catalyst and atomic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex synthesis methods, insufficient performance of SACs, catalyst loss of activity, etc., and achieve simple and effective synthesis methods , Good product selectivity, cheap raw materials

Active Publication Date: 2021-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large surface energy of a single metal atom, under the drive of the surface energy, a single metal atom is prone to migration and aggregation, which makes the catalyst inactive. How to stabilize a single metal atom is the key to the preparation of SACs
There are still many problems in the synthesis methods of SACs reported so far, such as complex synthesis methods, difficulty in large-scale preparation, expensive precursors used, poor performance of SACs with non-noble metal active sites, etc., and the preparation methods are often only suitable for one There is a lack of a general strategy for the preparation of SACs that is effective for multiple metals

Method used

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  • Method for synthesizing single-atom catalyst, single-atom catalyst and application
  • Method for synthesizing single-atom catalyst, single-atom catalyst and application
  • Method for synthesizing single-atom catalyst, single-atom catalyst and application

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Experimental program
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Effect test

Embodiment 1

[0035]Under magnetic stirring, add 8mL of emulsions containing 16wt% polystyrene nanospheres to the 50mL centrifuge tube (the emulsion density is calculated by 1.0g / mL, so 8mL emulsions contain 1.3 grams of PS nanospheres), 50wt% cyanamide Aqueous solution 2mL (50wt% cyanamide aqueous solution is 1.09g / mL, 2mL aqueous solution contains 1.2 grams of cyanamide), furfural 1mL, 0.1M dilute hydrochloric acid 0.4mL (pH of reaction solution is at 2.5~3), 10g / mL L (based on Fe element content) of FeCl 3 Solution 0.75mL, sealed reaction at 60°C, 500rpm stirring for 72h, placed in a drying oven at 100°C for 24h to obtain a high polymer; put the obtained high polymer in a tube furnace, in a nitrogen atmosphere to The temperature was raised to 1000°C at a rate of 4°C / min and maintained for 2 hours, and then cooled to room temperature at a rate of 6°C / min, and the obtained solid was fully ground to a fine powder to obtain nitrogen-doped carbon nanosheets anchored by a single Fe atom , cal...

Embodiment 2

[0037] Add 8mL of emulsion containing 16wt% polystyrene nanospheres, 2mL of 50wt% cyanamide aqueous solution, furfural 1mL, 0.1M dilute hydrochloric acid 0.4mL, 10g / L (in terms of Co element content) to 50mL centrifuge tube under magnetic stirring successively. ) CoCl 2 Solution 0.75mL, sealed reaction at 60°C, 500rpm stirring for 72h, placed in a drying oven at 100°C for 24h to obtain a high polymer; put the obtained high polymer in a tube furnace, in a nitrogen atmosphere to The temperature was raised to 900°C at a rate of 4°C / min and maintained for 3h, then cooled to room temperature at a rate of 6°C / min, and the obtained solid was fully ground to a fine powder to obtain nitrogen-doped carbon nanosheets anchored by a single Co atom , called Co-NCNSs.

Embodiment 3

[0039] Add 8mL of emulsion containing 16wt% polystyrene nanospheres, 2mL of 50wt% cyanamide aqueous solution, furfural 1mL, 0.1M dilute hydrochloric acid 0.4mL, 10g / L (in terms of Ni element content) to 50mL centrifuge tube successively under magnetic stirring. ) NiCl 2 Solution 0.75mL, sealed reaction at 60°C, 500rpm stirring for 72h, placed in a drying oven at 100°C for 24h to obtain a high polymer; put the obtained high polymer in a tube furnace, in a nitrogen atmosphere to The temperature was raised to 900°C at a rate of 4°C / min and maintained for 3 hours, then cooled to room temperature at a rate of 6°C / min, and the obtained solid was fully ground to a fine powder to obtain nitrogen-doped carbon nanosheets anchored by a single Ni atom , called Ni-NCNSs.

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Abstract

The invention belongs to the technical field of nanometer catalysts, and discloses a method for synthesizing single-atom catalysts, single-atom catalysts and applications. Method: 1) Under acidic conditions, polystyrene nanospheres are used as sacrificial templates to fully react cyanamide compounds, furfural and metal sources to obtain high polymers; the cyanamide compounds are cyanamide, More than one in dicyandiamide or melamine; the metal source is more than one in Fe source, Co source, Ni source, Pt source, Au source, Pd source; 2) in the atmosphere of protective gas, the polymer Perform high temperature pyrolysis to obtain single-atom catalysts. The method of the invention is simple, capable of synthesizing multiple metal single-atom catalysts, is a general method, and can be used for large-scale synthesis of single-atom catalysts, which solves the shortcomings of complex synthesis and difficult large-scale preparation of other existing technologies. The catalyst of the invention has excellent performance, is used for electrocatalytic chemical reactions, and is used as an electrocatalyst.

Description

technical field [0001] The invention belongs to the technical field of nanometer catalysts, and in particular relates to a general method for synthesizing single-atom catalysts, single-atom catalysts and applications. Background technique [0002] With the continuous consumption of fossil fuels and the environmental problems faced worldwide, finding more sustainable and renewable energy sources has become one of the most important topics in the world today. Currently, an important part of the sustainable development chain is electrochemical storage and conversion devices such as fuel cells, water splitting, and electrochemical reduction of carbon dioxide and nitrogen. For these energy storage and conversion devices to operate efficiently, electrocatalysts play a vital role in these electrochemical reactions. The further development of electrocatalysts and their enhanced electrochemical performances remain a challenge. [0003] Metal-based nanomaterials are the main type of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/075C25B11/081C25B1/04C25B3/23
CPCB01J37/0009C25B1/04C25B11/04C25B3/23B01J35/33B01J35/61Y02E60/36
Inventor 申益陈伟明
Owner SOUTH CHINA UNIV OF TECH
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